In Maricopa County, Helen Purcell of the Recorder's Office said workers have already begun counting about 770,000 early ballots.

She estimates voter turnout in Maricopa County to be around 70 to 75 percent. Thousands of election workers and dozens of troubleshooters will work together across the region to address any issues, should they arise.

"I don't anticipate any problems, but you never know until Election Day," Purcell said.

She anticipates rush hour at the polling locations to be between 6 a.m. and 9 a.m., as well as 4 p.m. to 7 p.m.

Purcell advises voters to know their ballots and voting locations before heading out the door.